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Image Quiz: A Chihuahua with traumatic bite wounds

An approximately 11-year-old neutered male Chihuahua was evaluated seven hours after being attacked by a larger dog. The dog had been transferred from a local emergency clinic after its condition had been stabilized. On physical examination, the dog had a 5-cm laceration on the left body wall, with subcutaneous fat and the head of the spleen protruding. A few other smaller lacerations were also evident. Abdominal radiographs were obtained.

Which of the following is the most likely cause of the large, curved gas-fluid opacity interface dorsal to the thoracic vertebral column on the lateral projection?